# Is 255 a Prime Number?

Is 255 a prime number? How do you know that 255 is prime or composite? Let us first understand what makes a number 'prime'. If a number has only 2 factors (1 and the number itself), then it is a prime number. If the number has more than 2 factors, then it is composite. Now, what do you think of 255? Is 255 a prime number? * "No, 255 is not a prime number."* Since 255 has more than 2 factors i.e. 1, 3, 5, 15, 17, 51, 85, 255, it is a composite number. Let's study this in detail.

**Is 255 a prime number? -**No**Is 255 a composite number? -**Yes**Prime Factors of 255 -**3, 5, 17**Is 255 a perfect square? -**No**Factors of 255 -**1, 3, 5, 15, 17, 51, 85, 255

## Is 255 a Prime Number?

No, 255 is not a prime number. The number 255 is divisible by 1, 3, 5, 15, 17, 51, 85, 255. For a number to be classified as a prime number, it should have exactly two factors. Since 255 has more than two factors, i.e. 1, 3, 5, 15, 17, 51, 85, 255, it is not a prime number.

## Why is 255 not a Prime Number?

To understand whether 255 is composite or prime, it is important to find its factors.

**Factors of 255:** 1, 3, 5, 15, 17, 51, 85, 255

Since 255 has more than 2 factors, we can say that 255 is not a prime number.

## Is 255 a Composite Number?

Yes, since 255 has more than two factors i.e. 1, 3, 5, 15, 17, 51, 85, 255. In other words, 255 is a composite number because 255 has more than 2 factors.

**Problem Statements: **

Is 255 a Prime Number? | No |

Is 255 a Composite Number? | Yes |

Is 255 a Perfect Square? | No |

Multiples of 255 | 255, 510, 765, 1020, 1275, 1530, 1785, 2040, 2295, 2550 |

Cube Root of 255 | 6.341314 |

Square Root of 255 | 15.968719 |

Is 255 an Even Number? | No |

Is 255 an Odd Number? | Yes |

Is 255 a Perfect Cube? | No |

Square of 255 | 65025 |

**Fun Facts: **

- Prime numbers greater than 5 can be represented in the form of either 6n + 1 or 6n - 1. Example - 71 is a prime number and it can be written as 71 = 6 × 12 - 1
- 1 is neither prime nor composite.
- 2 is the smallest prime number.

**☛ Also Check: **

- Is 99 a Prime Number? - No
- Is 15 a Prime Number? - No
- Is 30 a Prime Number? - No
- Is 21 a Prime Number? - No
- Is 24 a Prime Number? - No
- Is 207 a Prime Number? - No
- Is 40 a Prime Number? - No
- Is 1147 a Prime Number? - No

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